DEC PDP-11/70 Wire Lists

Johnny Billquist bqt at
Sun Jan 25 13:08:28 CST 2015

On 2015-01-25 15:22, Noel Chiappa wrote:
>      > From: Paul Birkel
>      > Wire Lists for any/all of the following:
>      >
>      > KB11-C 11/70 Processor  (or the older KB11-B)
>      > FP11-C 11/70 Floating-point processor  (or the older FP11-B, also used
>      > in 11/45 and 11/50)
>      > RH70 MASSBUS controller
> I don't know for sure about the 11/70 (I never looked at one closely), but
> for the 11/45 FPP, IIRC that was part of an integral multi-unit backplane
> assembly with the CPU, i.e. it was wired as part of a large wire mat that
> included the wiring for the CPU. So I don't think there's a separate wire
> list for the FPP. I would guess the same is true of the RH70.

Right. Everything is prewired in the backplane. And there is just one 
backplane, and it holds both the KB11-C, the FP11-C and the four RH70, 
as well as for Unibus slots.

> DEC generally included the wire lists in the engineering drawings; do the
> 11/70 prints not include the wire list?

I think I remember seeing the wire list in there, but it's been many 
years since I read through the 11/70 prints.


Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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